Straight-edge attachment.



H. H. HUNDLEY.

STRAIGHT EDGE ATTACHMENT.

APPLICATlON FILED .IUNEZQ, 1917.

1,267,665. Patented May 28,1918. 7

HAROLD H. HUNDLEY, 0F PANTHER, WEST VIRGINIA.

STRAIGHT-EDGE ATTAGHMEN T.

Specification of Letters Patent.

Patented May as, 1918.

Application filed June 29, 1917. Serial No. 177,780.

To all whom it may concern:

Be it known that I, HAROLD H. HUNDLEY, a citizen of the United States,and a resident of Panther, in the county of McDowell and State of WestVirginia, have invented a certain new and useful Improvement inStraight-Edge Attachments, of which the following is a specification.

The present invention relates to drafting instruments, and has for anobject to provide an attachment to a straightedge for supporting thesame and making unnecessary the use of the usual parallel rule.

The invention provides a pair of heads or brackets with rollers to moveover the surface of the drawing and to support a straight edge, thebrackets or heads being provided with improved means for gripping theopposite ends of the straight edge to support and carry the same duringthe adjustments of the device.

The above, and various other objects and advantages of this inventionwill be in part described, and in part understood, from the followingdetailed description of the present preferred embodiment, the same beingillustrated in the accompanying drawing where- 1n Figure 1 is a sideelevation of a pair of the devices of this invention as applied to astraight edge.

Fig. 2 is a side elevation of one of the heads or brackets employed, theview being enlarged and showing the clamp employed.

Fig. 3 is an outer end view of the bracket.

Fig. 4 is a longitudinal section taken sub stantially centrally throughthe bracket, showing the mounting of the roller therein and thearrangement of the clamp element.

Fig. 5 is an inner end view of the bracket or head.

Referring to this drawing, 10 designates the block or head which may beof any suitable fanciful configuration, and which is preferably providedwith opposed upwardly inclined and converging sides forming a lug 11upon the top of the block 10 by means of which the block may be graspedbetween the fingers. The block 10 is provided near one end, and in itsunder side with a transversely extending recess 12 in which is seated a.roller 13. As the recess 12 is formed near one end of the block 10, theend portion of the block provides a bracket arm 14: adapted to receivetherethrough a screw or pin 15 upon which the roller 13 is mounted.

The screw or pin 15 extends inwardly through the bracket arms 14 and theroller 13, and is preferably threaded into the body portion of the block10 by returning the pin in place and holding the roller 13 within thebracket part of the block, The roller 13 extends downwardly from theunder side of the block 10 a short distance to hold the block 10 inspaced relation from the surface over which the roller 13 may be moved.

The opposite or inner end of the block 10 is provided with a pair ofVertically spacedapart fork arms 16 and 17, which, as shown in Fig. 5,are relatively flat. The arm 16 is preferably made in a separate piecesecured at its inner end against the lower base portion of the block 10by screws 18 or the like, as shown in Fig. 4.

Between the fork arms 16 and 17, there is arranged a clamping plate 19which is swiveled upon the lower end of a set screw 20 provided with anarrowed head adapted to be turned for raising and lowering the clampingplate 19. The clamping plate 19 is relatively long and narrow to conformwith the width and substantially to the length of-the fork arms 16 and17, and the plate 19 is held from turning upon the screw 20 by means ofguide pins or studs 21 which pass downwardly through openings in theupper arm 17 of the block, and which have screw-threaded engagement withthe clamping plate 19 at their lower ends.

Preferably, the roller 13 is provided with transverse corrugations inits peripheral surface to thus insure the uniform moving or advancing ofthe opposite ends of a straight edge which may be secured between a pairof the blocks, and to afford a firm purchase of the roller 13 upon thesurface over Which the block is moved.

In use, a pair of the blocks 10 is employed, and the blocks are securedupon the opposite ends of a straight edge A, or othersuitably formedflat bar. The ends of the bar or straight edge A are engaged between thefork arms 16 and 17 and the screw 20 is turned in a direction to advancethe clamping plate 19 against the upper face of the straight edge A. Thestraight edge A is thus clamped at its end between the clamping plate 19and the lower fork arm 16 to firmly secure the block 10 upon the end ofthe straight edge. The arms 16 and 17 are preferably of a width equal tothat of the straight edge A, and are clamped in position thereon inlOllglttlClillfil alinenient with the straight edge so that the rollers13 travel in paths at right-angles to the longitudiiial axis of thestraight edge.

When the devices are thus secured to the opposite ends of the straightedge, the lugs or projections 11 may be engaged between the fingers ofthe opposite hand and the straight edge may thus be advanced over thedesired surface.

It is of course understood that various changes and modifications may hemade in the details of construction, and in the design of the parts ofthe above specifically described attachment without departing from thespirit of this invention, and being restricted only by the scope of thefollowing claims.

I claim:

1. The combination with a straight edge, of a pair of blocks, a rollermounted transversely in one end of each block and projecting therebelow,and clamping means can ried upon the other end of each block for bindinengagement with the o 1 Josite ends b L. V

of the straight ed e and for supporting the same for movement in anedgewise direction.

2. In a drafting instrument the combination of a block, a roller seatedin the lower face of the block and projecting therebelow to support theblock, said block being provided with a pair of spaced-apart armslaterali extending therefrom, and clamping means carried by one of saidarms to clamp a straight edge against the other arm.

3. In drafting instrument the combinationot a block provided with anupwardly extending lug adapted to be grasped by the fingers, a rollerseated in the lower face of the block, a pair of arms extendinglaterally from and in vertically spaced-apart relation to the block, aclamping plate arranged between said arms, and a set screw carried byone of the arms and having engagement with said clamping plate toadvance the same toward the opposite arm for clamping a straight edgebetween said arms.

at. In a drafting instrument, the combination of a block provided withan upstanding lug adapted to be grasped between the lingers, a rollerseated in the lower face of the block for supportlng the same, a pair ofarms extending from one side of the block and adapted to receive one endof a straight edge therebetween a clamping plate mounted between saidarms, a set screw swiveled to the clamping plate and engaging one ofsaid arms and guiding means carried by the clamping plate and engagingthe said arm to hold the clamping plate from turning with said setscrew.

HAROLD H. HUNDLEY.

Gopies of this patent may be obtained for five cents each, by addressingthe Gommissicner of Patents, Washington, D. ti.

